Malicious PDF — malware analysis report

Static analysis result for SHA-256 8440ec6e1607a0c0…

MALICIOUS

PDF

70.2 KB Created: 2021-03-19 06:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 63f0ab79c9951e8a4a9de0553a084535 SHA-1: 1283fa5245ffd5e66814c21cbfa73aee83956f4f SHA-256: 8440ec6e1607a0c00f01d6791c4889c6a258be85d47526b206d6a97338eb572e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/wix?keyword=pana+high+school+lumen PDF link annotation
    • http://larumutul.getenjoyment.net/aprendizaje_colaborativo_autores.pdfIn PDF document text
    • http://xuxodowenam.getenjoyment.net/68231758093.pdfIn PDF document text
    • https://zikazofikadit.weebly.com/uploads/1/3/0/7/130739129/6070009.pdfIn PDF document text
    • https://rujijixagav.weebly.com/uploads/1/3/1/3/131383475/kixikisuviwulav.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/635073470707ki3u.pdfIn PDF document text
    • http://freefire-gifts.com/what_are_the_12_steps_in_celebrate_recoveryz7x06.pdfIn PDF document text
    • http://nudistoff.club/373291382212l7i9.pdfIn PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/jufonu_wefobewu_dafifonub.pdfIn PDF document text
    • https://fopalese.weebly.com/uploads/1/3/5/3/135349797/fuzodowave_zosale.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/37506510167.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/dujen_tatef_lasifosiliguwuk_vuseze.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/buds_training_program.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/jojelumuposegimuzirok.pdfIn PDF document text
    • http://feyakast.online/is_bhagavad_gita_available_in_englishlzhs7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a9a565-0367-4952-8adf-78e0f872575d/heart_drawing_easy.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_eb76619e621c4e98be756a7ab688dd65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad0a096-8139-40d5-8aaf-0df7bdc43c12/grohe_kitchen_tap_cartridge.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_6f0a8aed364140f2a1be03a74f435c7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68020b8d-5e8f-432a-84df-c17785fca78c/wikuwupupizagava.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_873a141469d2444bbd25b18fdf3a6ae5.pdf?index=trueIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_f32b15c20c6043a397f89c0d01f9d26c.pdf?index=trueIn PDF document text
    • https://panasonic.net/cns/projector/products/rz21k/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 5116 bytes
SHA-256: 6ef171aa6431857e7f32dac4f845530e203203a17d658ef269b02ace225aecd2
font_01_sfnt_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 10628 bytes
SHA-256: 4ef1346f20266cbb81438956f256a2ad260576d279883633e92535685c2ed915